Tube or pebble mill.



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-TUBE 0R PEBBLE HILL.

` (Application led July 29, 1899.) (Elo Bndel.) ZiSheis--Sheai l.

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TUBE on PBBLE mm.. (Appliation med July 29, 1999.)

2 Sheets-Sheet 2.

(No Model.)

. hereinafter appear.

Atem* 'Fries'.

CHARLES L. CARMAN, or CHICAGO, ILLiNoIs, AssIeNoR To THE GATES l I-Ron Wenns, or SAME PLACE.

roes on PseBLE MILL.

- EGIFIGATION forming partei Letters Patent hl'o. 653,284, dated July 10, 1900.

,ippntautnnaarnyea1899. stanno. 725,485. (Nomade.) i

.To @ZZ whom it may 'oon/cern.l y

Be it 'known that l, CHARLES L. CARMAN, a citizen of the United States, residing at Chi-- cago, in the county of Cook and State of Illinois, have invented certain new and 4useful Improvements'in Tube or Pebble Mills, of which the following is a specicatien.

ll/Iy invention relatesto that class of mills in which there is combined a rotatable tubular portion having a grinding-chamber provided with a plurality of balls or pebbles, so that during the rotations of the tubular portion anyfmaterial which may he in. the mill is crushed and ground to the desired degree. The invention. relates particularly to the means by which the material is discharged from the mill, all of which will merefully The principal object of my invention is to provide a tube or pebble mill with means for economically and efficiently discharging the polverized material. I

Further objects of the invention will appear from an examination of the drawings and the following description and claims.

Tire invention consists in the features, comhinations, and details of construction hereinafter described and claimed.

ln the accompanying drawings, Figure l is a longitudinal sectional elevation of a mill construct-ed in accordance with my improvements, taken on line l 4 ofFig. 2; Fig. a

erosseectional view ot' a portion of the meehanisimtaiien online of Fig. l; and Fig. a plan view of a portion of the mechanism through which the ground material Ais discharged.

, In constructing a mill in accordance with my improvements l make a tubular portion A oi the desired size and strength and provided with a grinding-chamber adapted to hold the material and mechanisms for grinding.

'This tubular portion is provided with heads o, ando', having central tubnlar`journal por tions (t2 and et, upon which thc mill is rotan tahly mounted in pillow-blocks l. One of these head portions is provided with a spur-- gear U', hy which power andmotion are transinitted to the rotatable mechanism.

In use the mill is provided with a plurality ol balls or pebbles l), adapted during the rotation of the tubular portion to be raised on one side so that they fall down continuously and grind or crush any Vmaterialwvhieh may be contained in the mill.

To feed the material into the mill, the open-l ing of the journal o2 is provided with a feedscreiv E, so arranged .that when material is fed in through the opening e the rotations of the screw serve to force it into the grinding-chamber.

lt 'is desirable that somel simple and ef icient means be provided for withdrawing the ground` and crushed material, from the mill when it has been ground to the desired degree. snlt, I provide a discharge-tube G, which projects through the hollow journal as and into the grinding-chamber and at its inner end provide it with a Vreceptacle or pocket g, hav ing an inclined upper surface g', formed of a plurality' of ribs, hars,`or the like, constituting, as it were, an inclined grate or grid, down which the balls and ground material may slide during the rotations of the tubular portion. As shown in Fig. 2, the bars provide such a mesh that the balls willpass entirely over the grate or grid surfaee,while the ground `material passes therethrough into the dis- To facilitate the discharge material, a helical screw H is mounted in the dischargingbe rotated bythe pulley h and during its rotations to force the ground material into the discharge-spout l. While I prefer to use the bars, so as to form a grate or grid, it will be understood that I arrange them for the purpose of forming a screen and that any 'desired screenV may be used, although I consider the one herein shown and described as being the best fitted for this particular use.

While I have shown and described my improvements .as attached to a mill having hollow journals, it will be clearly apparent to those skilled in the art that they are app cable to all mills of this type, and particu` charging-tube. of the ground provided and tube, so as to larly to those mounted on rolls, Without dedesire to he limited than is pointed from the spirit of my invention and ICO FLO

claiml. `2in a mill of the class described, the conibiuation or". a rotatable tubular portion prowvided with a Orinding-chamber and an axial discharge-opening at one end cf the tubular portion, an inclined screen arranged inside the grinding-chamber of the tubular portion adjacent to the axial discharge-opening over which the balls or pebbles may pass and through which the ground material may be screened so as to be discharged through the discharge-opening, substantially as described,

ik ,ln a inill of the class described, the combination of a tubular portion provided with a hollow journal at one end, a tube projectin;l through the hollow journal and provided with a pocket on its inside portionin the grinding-chamber, an inclined upper surface formed oi a plurality of ribs or bars forming a screen on the pocket over which the balls or pebbles may pass and through which the materials may be screened so as to be discharged out through the' tubular portion thereof, substantially as described.

3. vIn a mill of the class described, the conibination of a tubular portion provided With a hollow journal at one end, a tube projecting through the hollow journal and provided with a pocket on its inside portion in the grinding-chamber, an inclined upper surface formed of a plurality of ribs or bars forming a screen on the pocket over which the balls or pebbles may pass and through which the materials may be screened 4so as to be dis-- charged out through the tubular portion. thereof, and a helical screw in the dischargetube for forcing the ground material out i through the tube, substantially as described.

CHARLES L. CARMAN.

Witnesses: R. L. TERRY,

'lnoMAs l. ll'lrnoon. 

